CN103543424A - Online monitoring device calibrating method for lightning arrester - Google Patents
Online monitoring device calibrating method for lightning arrester Download PDFInfo
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- CN103543424A CN103543424A CN201310505482.1A CN201310505482A CN103543424A CN 103543424 A CN103543424 A CN 103543424A CN 201310505482 A CN201310505482 A CN 201310505482A CN 103543424 A CN103543424 A CN 103543424A
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Abstract
The invention relates to an online monitoring device calibrating method for a lightning arrester, The online monitoring device calibrating method comprises the steps that a power supply can respectively supply for an online monitoring device of the lightning arrester and a high-stability harmonic current source, the high-stability harmonic current source can generate current flowing through the online monitoring device of the lightning arrester, the current can output appointed total current, resistive current fundamental wave or resistive current harmonic according to preset, the online monitoring device of the lightning arrester can monitor current generated by the high-stability harmonic current source in the step 2, the current generated by the high-stability harmonic current source can be measured and displayed by a first current measuring unit of the online monitoring device of the lightning arrester, a second current measuring unit is utilized to measure and display the high-stability harmonic current source, and a measuring result analyzing unit can read a current measurement value of the first current measuring unit and a current measurement value of the second current measuring unit, calculates error and judges whether error is qualified. The online monitoring device calibrating method is convenient to operate, high in calibrating efficiency and wide in application range.
Description
Technical field
The invention belongs to lightning arrester safety monitoring assembly field, particularly a kind of lightning arrester on-Line Monitor Device method of calibration.
Background technology
In the long-term continuous service process of lightning arrester, leakage current can cause that its volt-ampere characteristic changes, and causes Zinc-Oxide Arrester valve block aging, until there is thermal breakdown.Internal wetted or built-in electrical insulation support insulating property are bad, also can make power current increase, and power consumption aggravation, may cause internal discharge when serious, and this will cause main equipment to can not get protection.When serious, may blast, affect the safe operation of system.The appearance of lightning arrester on-Line Monitor Device, has changed must the stop transport situation of main equipment of prerun, can pass through the lightning arrester operational factor of real time on-line monitoring, judges its operating mode, has greatly improved purpose and the specific aim of prerun test.
Existing lightning arrester on-Line Monitor Device, the monitoring method of employing has two classes substantially, i.e. total current method (total leakage current method) and harmonic analysis method.Total current method is mainly aging according to lightning arrester or is subject to the time of tide, current in resistance property increase, thus this feature that total current increases thereupon judges the ruuning situation of lightning arrester.But the resistive component of total current only accounts for 10% left and right of capacitive component, and both fundamental phase differ 90 degree, this makes the circuital effective value or the mean value that monitor depend mainly on capacitive current component, even current in resistance property doubles, total current changes also not obvious.Frequency analysis rule is to adopt electric current and component thereof to carry out the method that frequency analysis draws corresponding characteristic quantity, principal character amount is resistive current component and first-harmonic and third harmonic, adopt microprocessor and utilize Digital Signal Processing analysis, so also claim digital waveform analytic approach.
But a lot of lightning arrester on-Line Monitor Device is not all carried out complete detection accurately before installation at present.Be mainly not have a kind of unified method of calibration to be applicable to above-mentioned two kinds of monitoring devices, realize the accurately verification fast to lightning arrester on-Line Monitor Device.
Summary of the invention
The object of the present invention is to provide a kind of method of calibration that can carry out verification to lightning arrester on-Line Monitor Device leakage current total current, current in resistance property and harmonic wave thereof, it is applicable to two kinds of lightning arrester on-Line Monitor Device, can meet the accuracy verification of existing lightning arrester on-Line Monitor Device.
The present invention solves its technical matters and takes following technical scheme to realize:
An on-Line Monitor Device method of calibration, is characterized in that: the step of this method of calibration is:
(1). power supply is respectively lightning arrester on-Line Monitor Device and high stability harmonic current source provides power supply;
(2). high stability harmonic current source produces the electric current of the lightning arrester on-Line Monitor Device of flowing through, and this electric current is according to total current, resistive current first harmonics or the current in resistance property harmonic wave of default output appointment;
(3). by the lightning arrester on-Line Monitor Device monitoring step electric current that (2) middle high stability harmonic current source produces, and measure and show through the first current measuring unit of lightning arrester on-Line Monitor Device;
(4). by the second current measuring unit, high stability harmonic current source is measured and shown;
(5). measurement result analytic unit reads the current measurement numerical value of the first current measuring unit and the current measurement numerical value of the second current measuring unit, the error of calculation, and make the judgement whether error is qualified.
Described high stability harmonic current source is by AC power, rectifier transformer, PWM rectifier bridge, low frequency Cascade H bridge module, high frequency Cascade H bridge module, low frequency connects reactance, high frequency connects reactance and comprehensive current output terminal mouth forms, the output terminal of AC power connects rectifier transformer, the output terminal of rectifier transformer connects PWM rectifier bridge, the output terminal of PWM rectifier bridge connects respectively low frequency Cascade H bridge module and high frequency Cascade H bridge module, low frequency Cascade H bridge module and high frequency Cascade H bridge module by low frequency, connect reactance respectively and high frequency connection reactance is connected to comprehensive current output terminal mouth jointly.
Described error account form is:
In formula:
δ: current measurement relative error (first-harmonic and each harmonic);
I
0: the second current measuring unit measured value;
I
1: the first current measuring unit measured value.
The judgment mode whether described error is qualified is:
In formula: Δ I is the limits of error, its value is provided by lightning arrester on-Line Monitor Device technical indicator.
Described AC power adopts civil power 220V.
Described rectifier transformer adopts JBKZ type single-phase rectifier transformer.
Described PWM rectifier bridge adopts MTQ250, MTQ200, MTQ150, the single-phase full-controlled rectifier bridge module of MTQ100.
Described low frequency connects reactance and adopts smoothing reactor DLK-7.5 type.
Described high frequency connects reactance and adopts Siemens 6SN1111-0AA00-0BA1 type high-frequency rectification reactor.
Advantage of the present invention and good effect are:
1. lightning arrester on-Line Monitor Device method of calibration of the present invention, can judge lightning arrester on-Line Monitor Device current measurement accuracy, guarantees its value before installation accurately and reliably.
2. lightning arrester on-Line Monitor Device method of calibration of the present invention, the accuracy of current in resistance property, total current and current in resistance property harmonic wave value that can verification lightning arrester on-Line Monitor Device.
3. scientific structure design of the present invention is reasonable, and lightning arrester on-Line Monitor Device method of calibration is easy to operate, and verification efficiency is high, and method of calibration is applied widely, has application value.
Accompanying drawing explanation
Fig. 1 is the structural representation of lightning arrester on-Line Monitor Device check system of the present invention;
Fig. 2 is the functional-block diagram of high stability harmonic current source of the present invention.
Embodiment
Below in conjunction with accompanying drawing, by specific embodiment, the invention will be further described.Following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
First, lightning arrester on-Line Monitor Device check system method of calibration of the present invention being adopted describes.It consists of lightning arrester on-Line Monitor Device check system power supply, high stability harmonic current source, the first current measuring unit, the second current measuring unit and measurement result analytic unit.Participate in shown in Fig. 1.
Power supply output terminal is connected to respectively lightning arrester on-Line Monitor Device and described high stability harmonic current source, and power supply provides power supply for lightning arrester on-Line Monitor Device and high stability harmonic current source.The output terminal of high stability harmonic current source connects lightning arrester on-Line Monitor Device, and high stability harmonic current source is for generation of the electric current of the lightning arrester on-Line Monitor Device of flowing through.Lightning arrester monitoring device connects described the first current measuring unit, the electric current that lightning arrester on-Line Monitor Device monitoring high stability harmonic current source produces, and measure and show through the first current measuring unit.High stability harmonic current source connects described the second current measuring unit, and this second current measuring unit is measured the electric current of high stability harmonic current source and shown; The current signal output end of described the first current measuring unit and the second current measuring unit is connected to measurement result analytic unit, and measurement result analytic unit judges after reading the current values of the first current measuring unit, the second current measuring unit.
High stability harmonic current source connects reactance, high frequency connection reactance and comprehensive current output terminal mouth by AC power, rectifier transformer, PWM rectifier bridge, low frequency Cascade H bridge module, high frequency Cascade H bridge module, low frequency and forms.Shown in Fig. 2.The output terminal of AC power connects rectifier transformer, the output terminal of rectifier transformer connects PWM rectifier bridge, the output terminal of PWM rectifier bridge connects respectively low frequency Cascade H bridge module and high frequency Cascade H bridge module, and low frequency Cascade H bridge module and high frequency Cascade H bridge module by low frequency, connect reactance respectively and high frequency connection reactance is connected to comprehensive current output terminal mouth jointly.
The principle of work of high stability harmonic current source is:
As shown in Figure 2, single-phase rectifier transformer, by after AC power step-down isolation, charges to N PWM rectification H bridge module by N low pressure winding respectively, sets up DC bus-bar voltage.The DC bus parallel connection of each PWM rectification H bridge module discharge paths, to control DC bus-bar voltage, only limit, thus protection power electronic devices safety.N PWM rectification H bridge module is divided into two groups, wherein one group is comprised of a PWM rectification H bridge module, its DC bus connects the input end of high frequency Cascade H bridge module, another group is comprised of N-1 PWM rectification H bridge module, and their DC bus connects respectively the input end of N-1 low frequency Cascade H bridge module.High frequency Cascade H bridge module according to according to steering order based on hysteresis current control algolithm, as constant current source, produce 11 times-31 times higher harmonic currents, then by high frequency, connecting reactance, to be connected to comprehensive current output terminal.Low frequency Cascade H bridge module based on phase-shifting carrier wave control algolithm, produces 2-10 subharmonic current as constant pressure source according to steering order, and the 11-31 subharmonic current producing with high frequency Cascade H bridge module superposes at comprehensive current output terminal mouth, produces total harmonic current.
Described power supply adopts civil power 220V.
Described interpretation of result unit adopts 8051 single-chip microcomputers, and display section adopts the YD301CF model color monitor of ureika.
Described AC power adopts civil power 220V.
Described rectifier transformer adopts JBKZ type single-phase rectifier transformer.
Described PWM rectifier bridge adopts MTQ250, MTQ200, MTQ150, the single-phase full-controlled rectifier bridge module of MTQ100.
Described low frequency connects reactance and adopts smoothing reactor DLK-7.5 type.
Described high frequency connects reactance and adopts Siemens 6SN1111-0AA00-0BA1 type high-frequency rectification reactor.
Lightning arrester on-Line Monitor Device method of calibration of the present invention, the step of its method of calibration is:
(1). power supply is respectively lightning arrester on-Line Monitor Device and high stability harmonic current source provides power supply;
(2). high stability harmonic current source produces the electric current of the lightning arrester on-Line Monitor Device of flowing through, and this electric current is according to total current, resistive current first harmonics or the current in resistance property harmonic wave of default output appointment, and current in resistance property harmonic wave is current in resistance property 3 times, 5 times and 7 subharmonic.
(3). by the lightning arrester on-Line Monitor Device monitoring step electric current that (2) middle high stability harmonic current source produces, and measure and show through the first current measuring unit of lightning arrester on-Line Monitor Device.Different according to working method, the demonstration of current values can adopt local display unit or be sent to background program through communication port and show.
(4). by the second current measuring unit, high stability harmonic current source is measured and shown; Different according to working method, the demonstration of current values can adopt local display unit or be sent to background program through communication port and show.
(5). measurement result analytic unit reads the current measurement numerical value of the first current measuring unit and the current measurement numerical value of the second current measuring unit, the error of calculation, and make the judgement whether error is qualified.
Described error account form is:
In formula:
δ: current measurement relative error (first-harmonic and each harmonic);
I
0: the second current measuring unit measured value;
I
1: the first current measuring unit measured value.
The judgment mode whether described error is qualified is:
In formula: Δ I is the limits of error, its value is provided by lightning arrester on-Line Monitor Device technical indicator.
This analytic unit also can comprise and provide function of reporting.
Although disclose for the purpose of illustration embodiments of the invention and accompanying drawing, but it will be appreciated by those skilled in the art that: within not departing from the spirit and scope of the present invention and claims, various replacements, variation and modification are all possible, therefore, scope of the present invention is not limited to embodiment and the disclosed content of accompanying drawing.
Claims (7)
1. a lightning arrester on-Line Monitor Device method of calibration, is characterized in that: the step of this method of calibration is:
(1). power supply is respectively lightning arrester on-Line Monitor Device and high stability harmonic current source provides power supply;
(2). high stability harmonic current source produces the electric current of the lightning arrester on-Line Monitor Device of flowing through, and this electric current is according to total current, resistive current first harmonics or the current in resistance property harmonic wave of default output appointment;
(3). by the lightning arrester on-Line Monitor Device monitoring step electric current that (2) middle high stability harmonic current source produces, and measure and show through the first current measuring unit of lightning arrester on-Line Monitor Device;
(4). by the second current measuring unit, high stability harmonic current source is measured and shown;
(5). measurement result analytic unit reads the current measurement numerical value of the first current measuring unit and the current measurement numerical value of the second current measuring unit, the error of calculation, and make the judgement whether error is qualified.
2. lightning arrester on-Line Monitor Device method of calibration according to claim 1, is characterized in that:
Described error account form is:
In formula:
δ: current measurement relative error (first-harmonic and each harmonic);
I
0: the second current measuring unit measured value;
I
1: the first current measuring unit measured value.
The judgment mode whether described error is qualified is:
In formula: Δ I is the limits of error, its value is provided by lightning arrester on-Line Monitor Device technical indicator.
3. lightning arrester on-Line Monitor Device method of calibration according to claim 1, it is characterized in that: described high stability harmonic current source is by AC power, rectifier transformer, PWM rectifier bridge, low frequency Cascade H bridge module, high frequency Cascade H bridge module, low frequency connects reactance, high frequency connects reactance and comprehensive current output terminal mouth forms, the output terminal of AC power connects rectifier transformer, the output terminal of rectifier transformer connects PWM rectifier bridge, the output terminal of PWM rectifier bridge connects respectively low frequency Cascade H bridge module and high frequency Cascade H bridge module, low frequency Cascade H bridge module and high frequency Cascade H bridge module by low frequency, connect reactance respectively and high frequency connection reactance is connected to comprehensive current output terminal mouth jointly.
4. lightning arrester on-Line Monitor Device check system according to claim 3, is characterized in that: described AC power adopts civil power 220V.
5. lightning arrester on-Line Monitor Device check system according to claim 3, is characterized in that: described rectifier transformer adopts JBKZ type single-phase rectifier transformer.
6. lightning arrester on-Line Monitor Device check system according to claim 3, is characterized in that: described PWM rectifier bridge adopts MTQ250, MTQ200, MTQ150, the single-phase full-controlled rectifier bridge module of MTQ100.
7. lightning arrester on-Line Monitor Device check system according to claim 3, is characterized in that: described low frequency connects reactance and adopts smoothing reactor DLK-7.5 type; Described high frequency connects reactance and adopts Siemens 6SN1111-0AA00-0BA1 type high-frequency rectification reactor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109765515A (en) * | 2018-12-28 | 2019-05-17 | 国网辽宁省电力有限公司电力科学研究院 | On-Line Monitor Device data accuracy intelligent checking system |
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